Encryption strenght with SQL Server self-signed certificate

I have SQL Server 2008 R2 Standard (64-bits) on Windows Server 2008 R2 Enterprise (64-bits) and client computers running on Windows 7 Professional (64-bits). If I set "Encrypt=True;TrustServerCertificate=True;" in connection strings, I'm wondering
what encryption level or strength (40bits, 128bits, or other) are the connections getting?
Microsoft is not clear about this topic:
"The level of encryption used by SSL, 40-bit or 128-bit, depends on the version of the Microsoft Windows operating system that is running on the application and database computers."
I appreciate any comment.

Please see the discussion thread on this other post:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/ee159a8b-0b07-4637-83e7-d0487fc63a9e/which-cipher-current-supported-after-force-encryption?forum=sqlsecurity
Hopefully this information will help.
-Raul Garcia
  SQL Server Security
This posting is provided "AS IS" with no warranties, and confers no rights.

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    dsadm disable-service <instance>
    Change Certificate Database Password:
    dsadm set-flags <instance> cert-pwd-prompt=on
         Choose the new certificate database password:
         Confirm the new certificate database password:
    Certificate database password successfully updated.
    Restart the instance from the dscc:
    DSCC -> start <instance>
    Now add a new Certificate which lasts for ten years (120 months; -v 120):
    `cd <instance_path>`
    `certutil -S -d . -P slapd- -s "CN=<FQDN_server_name>" �n testcert �v 120 -t T,, -x`
         Enter Password or Pin for "NSS Certificate DB":
    Stop the Instance.
    On the DSCC Security -> Certificates tab:
         select option to "Do not Prompt for Password"
    Restart the instance.
    On the Security -> General tab, select the new certificate to use for ssl encryption
    Restart the instance
    Stop the instance
    Put DS back into smf control:
    dsadm enable-service <instance>
    Check the smf:
    svcs -a | grep ds
    # svcs -a|grep ds
    disabled Aug_16 svc:/application/sun/ds:default
    online Aug_16 svc:/application/sun/ds:ds--var-opt-SUNWdsee-dscc6-dcc-ads
    online 17:04:28 svc:/application/sun/ds:ds--var-opt-SUNWdsee-dsins1

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